Sentinel of the Tempest

Just like the Voice of the Tempest, the Sentinel of the Tempest is chosen at birth.  The Sentinel of the Tempest and the Voice of the Tempest are almost always siblings who begin their Druidic training together but once they reach a certain age their training branches off from one another. When the Sentinel comes of age they are put through dangerous trials to prove that they are able to protect the Tempest and lead the Tribe’s warriors.

The Sentinel’s life force is linked to the Tempest’s and age at the same rate as them. 

You have mastered techniques to protect the Voice of the Tempest along with the ability to take advantage of every drop in any enemy's guard, gaining the following benefits:

• You can use your reaction to deflect or catch a missle if you or an ally within 5 feet of you are hit by a ranged weapon attack. You can reduce the damage by 1d10 + your Dexterity modifier, provided that you have free hand. If you reduce the damage to 0, you catch the missle if it is small enough to hold in that hand.
• When you hit a creature with an opportunity attack, the creature's speed becomes 0 for the rest of the turn.
• Creatures provoke opportunity attacks from you even if they take the Disengage action before leaving your reach.
• When a creature within 5 feet of you makes an attack against a target other than you (and that target doesn't have this feat), you can use your reaction to make a melee weapon attack against the attacking creature.